#!/usr/bin/sh

if test $# -ne 1; then
    echo "Usage: `basename $0 .sh` <process-id>" 1>&2
    exit 1
fi

if test ! -r /proc/$1; then
    echo "Process $1 not found." 1>&2
    exit 1
fi

# GDB doesn't allow "thread apply all bt" when the process isn't
# threaded; need to peek at the process to determine if that or the
# simpler "bt" should be used.

backtrace="photon_ps"
if test -d /proc/$1/task ; then
    # Newer kernel; has a task/ directory.
    if test `/bin/ls /proc/$1/task | /usr/bin/wc -l` -gt 1 2>/dev/null ; then
	backtrace="thread apply all photon_ps"
    fi
elif test -f /proc/$1/maps ; then
    # Older kernel; go by it loading libpthread.
    if /bin/grep -e libpthread /proc/$1/maps > /dev/null 2>&1 ; then
	backtrace="thread apply all photon_ps"
    fi
fi

GDB=${GDB:-gdb}
PHOTONDB=${PHOTONDB:-/usr/local/lib/photon/tools/photongdb.py}
PHOTONSO=${PHOTONSO:-/usr/local/lib/libphoton.so}

# Run GDB, strip out unwanted noise.
# --readnever is no longer used since .gdb_index is now in use.
$GDB --quiet -nx $GDBARGS /proc/$1/exe $1 <<EOF 2>&1 | 
set width 0
set height 0
set pagination no
source $PHOTONDB
add-symbol-file $PHOTONSO
$backtrace
EOF
/bin/sed -n \
    -e 's/^\((gdb) \)*//' \
    -e '/^#/p' \
    -e '/^Thread/p' \
    -e '/CURRENT/p' \
    -e '/READY/p' \
    -e '/SLEEP/p'